4. SUSPENSION DESIGN: The inner part would float on the water if the two parts accidently separate from each other. Help to avoid the trouble of the inner part sink to the bottom.

5. TWO-SIDED CLEAN: One part is made of fine fleece, perfect for the outer side of the aquarium, do not scratch the surface; The other part is cellosilk, effectively clean the inner side of the aquarium. The two parts combined perfectly, protect the tank as well as clean it;